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          Mybatis-plus的lambda表达式
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        <h4 id="java1-8的新特性"><a href="#java1-8的新特性" class="headerlink" title="java1.8的新特性"></a>java1.8的新特性</h4><h5 id="lambda表达式"><a href="#lambda表达式" class="headerlink" title="lambda表达式"></a>lambda表达式</h5><p>基本语法</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">（parameters） -&gt; expression</span><br><span class="line">或</span><br><span class="line">（parameters） -&gt; &#123;statements;&#125;</span><br></pre></td></tr></table></figure>
<p>一些基本的lambda表达式的例子：</p>
<p><img src="http://localhost:4000/2020/07/23/Mybatis-plus%E7%9A%84lambda%E8%A1%A8%E8%BE%BE%E5%BC%8F/001.png" alt></p>
<h5 id="方法引用"><a href="#方法引用" class="headerlink" title="方法引用"></a>方法引用</h5><p>本质上，方法引用就是一个lambda表达式</p>
<p>基本语法</p>
<p><code>类名::方法名</code></p>
<p>四种形式的方法引用</p>
<div class="table-container">
<table>
<thead>
<tr>
<th>类型</th>
<th>示例</th>
</tr>
</thead>
<tbody>
<tr>
<td>引用静态方法</td>
<td>ContainingClass::staticMethodName</td>
</tr>
<tr>
<td>引用某个对象的实例方法</td>
<td>containingObject::instanceMethodName</td>
</tr>
<tr>
<td>引用某个类型的任意对象的实例方法</td>
<td>ContainingType::methodName</td>
</tr>
<tr>
<td>引用构造方法</td>
<td>ClassName::new</td>
</tr>
</tbody>
</table>
</div>
<h4 id="mybatis-plus使用lambda方式的几个demo"><a href="#mybatis-plus使用lambda方式的几个demo" class="headerlink" title="mybatis plus使用lambda方式的几个demo"></a>mybatis plus使用lambda方式的几个demo</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="keyword">void</span> <span class="title function_">testPluralLambda</span><span class="params">()</span> &#123;</span><br><span class="line">	TableIntoHelper.initTableInfo(<span class="literal">null</span>, User.class);</span><br><span class="line">	QueryWrapper&lt;User&gt; queryWrapper = <span class="keyword">new</span> <span class="title class_">QueryWrapper</span>&lt;&gt;();</span><br><span class="line">	queryWrapper.lambda().eq(User::getName, <span class="string">&quot;sss&quot;</span>);</span><br><span class="line">	queryWrapper.lambda().eq(User::getName, <span class="string">&quot;sss2&quot;</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h5 id="查询"><a href="#查询" class="headerlink" title="查询"></a>查询</h5><p>通过字段匹配查询，并按照时间排序</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">baseMapper.selectList(<span class="keyword">new</span> <span class="title class_">QueryWrapper</span>&lt;Entity&gt;()</span><br><span class="line">						.lambda()</span><br><span class="line">						.eq(Entity::getId, <span class="string">&#x27;id&#x27;</span>)</span><br><span class="line">						.orderByDesc(Entity::getCreateTime)</span><br><span class="line">)</span><br></pre></td></tr></table></figure>
<h5 id="删除"><a href="#删除" class="headerlink" title="删除"></a>删除</h5><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">demoService.delete(<span class="keyword">new</span> <span class="title class_">QueryWrapper</span>&lt;Entity&gt;()</span><br><span class="line">					.lambda()</span><br><span class="line">					.eq(Entity::getShareType, shareType)</span><br><span class="line">)</span><br></pre></td></tr></table></figure>

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